Propeller



F. FOLEY.

PRoPELLjjg` APPLICAIWM web :uns lo. ma.

1,3555'758.a Panted. 00h121920.

UNITED STATES PATENT oFFlcEQ FRANK roLEY, or r'r'mrvrnw,V ARKANSAS.

PROPELLER.

Application iled June 10,

To all whom t may concern:

Be it known that I, FRANK FOLEY, a citi- Zen of the United States, and aresident of Mayview, in the county of Arkansas and State of Arkansas,have invented certain new and` useful Improvements in Propellers, ofwhich the 'following is a specification. v

My invention is an improvement in pro pellers, and has for its object'toprovide a device of the character specified especially adapted for usein flying machines, wherein the propeller` has a blade of spiral form,so arranged that the pitch of the blade may be varied.

In the drawings:

Figure 1 is a top plan view of one embodiment of propeller construction;

Fig. 2 is a top plan view of another embodiment of the invention;

Fig. 3 is a side view of Fig. 1; Y

Fig. 4 is a front view of one of the pro-V pellers showing the mounting;

Fig. 5 is a side view of Fig. 4 in closed position.

The improved propeller is mounted upon a shaft 1, and the propeller iscomposed of similar sections, each section being approximately a halfcircle. In Fig. leach section is composed of concentric arch bars 2, 3and 4, and spokes 5 connect the archbars. Each spoke 5 is double,extending on both sides of the propeller shaft, and each spoke has a hub6 which engages the propeller shaft, the hub being at the center of thespoke. The end spokes 5 of each wing section are continuous with theopposite spoke of the other wing section, and the same statement applies to the intermediate spokes, that is, each spoke, or each doublespoke, forms a part of both wing sections. Y

A suitable cover 8 is provided for each wing section. the saidcoverbeing supported by the arch bars and the spokes.

The uppermost spoke 5 is fixed to the shaft 1, and it is guyed by guywires 9 which extend from a head 7 on the upper end of the shaft to theopposite ends of the spoke. The hubs of the other spokes are slidable onthe shaft` and exible members 10, as, for instance, cords or cables, areconnected with the lowermost spoke and with the arch bars 2 for pullingthe lowermost spoke downwardlv to increase the pitch of the blade formedbv the propeller sections.

It is obvious that V'Wirren the `lovvermost 10 pass.

Specication of Lettersatent. Patented Oct, 12', 1920,

191s. serial No. 239,220.

spoke moves upwardly the pitch will be lessened, while when the spoke ismoved downwardly the pitch will be increased. Any suitable operatingmeans may be connected with the cords 10 for controlling the same.

In Fig. 2 is shown a modified form of propeller.l In this arrangementeach of the sections consists of arc shaped bars 11, 12 and `13, whichare connected by spokes or radial bars 14, the said spokes beingY doublein the same manner as in the construction of Fig. 1. Each double spokehas a hub 15 at its center for engaging the shaft 1, and the innermostarch bars 13 are somewhat greater 'the propeller blades the cords 10 aredrawn downward and when the tension on the cords is relaxed the naturalresiliency of the bars from which the propellers are formed will tend tocause them to return to original position. f

The operating mechanism for increasing or decreasing the pitch of theblades consists of a sleeve or collar 18 mounted upon the propellershaft 1, and this sleeve has pulleys 19 over which the flexible membersEach of the sleeves or collars 18 has pivoted thereto a link 20 and theother end of each link is connected to one end of a lever 21 pivoted atits inner end to a brace 22 on the frame 23`which supports the propellershaft.

A flexible member 24, as, for instance. a Y

l y I claim: Y bar, means for drawing down the lower` bur, 10 l In a,flying machine, a propellery eompris- Vand a connection between saidbarsjfor hold- Y Y f ing in combination with the shaft, a Vseries Y ingthem in vertically'spaeed relation when of bars;1 eaelmvngi a min atVeener they @removedv downwardly. Y Y v 5m0unte tosi eonties :LT/,sai arse- V7 ing'arranged in spaced relation and extendv FRANK FOLQ ing onopposite sides of the shaft, a flexible Witnesses:

covering secured to the bars at' each side of E. H.V`N0BLE,. l theshaft, meansV for anchoring the upper BC. THIELMAN.

